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  <title>Document</title>
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  <script>
    function createCounter(initialValue) {
      let count = initialValue;

      return function (resetValue) {
        if (typeof resetValue === 'number') {
          count = resetValue;
          count++;

        } else {
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        return count;
      }
    }


    //实现以下效果
    const counter = createCounter(5);
    console.log(counter()); // 6
    console.log(counter()); // 7
    console.log(counter()); // 8
    console.log(counter(10)); // 11
    console.log(counter()); // 12
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